Petmate'S Disposable Plastic Liners Make Cleanup A Snap. Spread Liner Over Litter Pan So That It Overhangs Rim On All Sides. Press Center Of Liner Down To Bottom Of Pan, & Smooth Outward. Fill The Pan & Liner With Litter According To Package Directions. Sift Out Solid Waste Daily. To Remove Litter Simply Lift The Liner From All Sides, Gather Above Pan & Tie.